Method of making abrasive belts



Sept. 20, 1938. J, BAKER 2,130,753

I METHOD OF MAKING ABRASIVE BELTS Filed Oct. 29, 1937 arvucmiob JHMES Haw/mu BFIKER (1H0: MA

Patented Sept. 20, 1938 UNITED STATES PATENT OFFICE METHOD OF MAKING ABRASIVE BELTS Application October 29, 1937, Serial No. 171,663

1 Claim.

The invention relates to abrasive belts and to a method of manufacture thereof.

One objectof the invention is to provide a cheaper way of making abrasive belts. Another object of the invention is to provide a method of manufacture whereby several belts may be made in one operation.

The invention accordingly consists in the features, of construction, combinations of elements, arrangements of parts, and in the several steps and relation and order of each of said steps to one or more of the others thereof, all as will be illustratively described herein, and the scope of the application of which will be indicated in the following claim.

' In the accompanying drawing showing one of many possible embodiments of the mechanical features of this invention, 1

Figure l is a vertical sectional view through certain apparatus for manufacturing belts according to the present invention;

Figure 2 is a perspective view of another apparatus used in the production of belts according to the invention;

Figure 3 is a plan view of the belts at one stage in their manufacture;

Figure 4 is' a perspective view of a plurality of belts just before separation, and

Figure 5 is a view showing the final articles.

Referring first to Figure 1, upon any suitable support such as the top of a work bench lll, I

provide the apparatus shown in Figure l. I provide a shaft journalled in bearings in a pair of supports l2 aflixed to thebench II]. In the 5 case of the journal supports l2, as in the case of other journal supports, only one thereof is shown since Figure l is a sectional view.

Upon the shaft II, I mount a roll |3 holding a supply of coated abrasive material M which is 40 wound upon the roll l3. The coated abrasive material may be of any desired sort. For example, the abrasive may consist of aluminum oxide, silicon carbide, garnet, quartz, emery or the like, and the backing may consist of paper or 45 cloth of any variety or combination of paper and cloth. The bond may be and usually is glue but other bonds such as waterproof bonds and resinous bonds may be provided.

I further provide a roller l5 mounted in jour-v 50 nals provided in supports l6 affixed to the bench I0. I further provide a large diameter metal 'roll I! mounted in journals in journal supports I8 affixed to the bench I0. I further provide an idler roll l9 mounted in journals in journal sup- 55 ports 20 aflixed to the bench HI. I further pro- Port 23 affixed to the bench l0.

vide a take-up roll 2|, preferably made of wood and similar to the roll l3, mounted on a shaft 22 which is journalled in journals in a journal sup- Secured to the shaft 22 is a large pulley24. The pulley 24 is 5 driven by a belt 25 passing around a small pulley 26 on the armature shaft 21 of a motor 28 which is likewise affixed to the bench In.

The operator pulls off some of the coated abrasive material |4a from the roll |4, winding it around the take-up roll 2|, and securing it in place by means of a removable bar 30. When the motor 28 is energized, as by means of a switch 3|, the take-up roll 2| will be revolved, thus tending to fill up the take-up roller with coated abrasive material |4a which is drawn from the roll M of coated abrasive material which was initially provided.

I further provide a standard 32 fastened to the bench Ill and braced thereto by a brace 33. A bell crank lever 34 is mounted upon a shaft 35 which is fastened to the standard 32 by means of brackets 36. This bell crank lever 34 has a forked portion 31 in the front thereof in which is mounted a second bell crank lever 38 pivoted on a pin 39 passing through the forked portion 31.. The second bell crank lever 38 has a front forked portion 40 in which is journalled a scoring disk 4| mounted on a pin 42.

For primary adjustment, I provide a screw 43 having a knurled portion 44 which is in threaded engagement with the upper end of the bell crank lever 34 and abuts the front surface of a cross member 45 attached to the standard 32. For secondary adjustment, I provide a screw 46 in threaded engagement with the upper end of the bell crank lever 40 and abutting a front surface of the bell crank lever 34.

The scorer 4| consists of a steel disk with a V shaped periphery 48.

The coated abrasive material I4 is wound with the abrasive on the outside. The rollers l5 and I9 serve to keep it in peripheral engagement with the roller I! which acts as an anvil. As the strip of coated abrasive |4a is drawn off the 45 roll l4, it passes under the cutting V edge 48 of the scorer 4| and is scored. When a considerable portion has been wound upon the roll 2|, too high speed of drawing the material W1 is prevented by slippage of the belt 25. In other 50 words, the natural tendency of any direct winding mechanism, being to speed up as the take-up roll is wound, is offset by the fact that a friction drive is provided. I preferably provide bolts 50 to secure the motor 28 in place which pass through long slots 5| in the motor base whereby the tension on the belt 25 may be adjusted.

-By means of the apparatus shown, a roll of coated abrasive material M may be scored. I adjust the screws 43 and 46 so that the backing of the coated abrasive material will not be entirely broken or severed; there is just sufiicient strength left to hold the two portions together. Instead of dividing the coated abrasive material into two parts, as shown, I may provide additional scorers M and associated mechanism and split the coated abrasive material into three, four, five or more parts. I prefer, however, to score it in one or two places so that it will split into two or three parts.

I now out the material Ma into suitable lengths on the bias at any desired angle. I prefer an angle of as indicated in Figure 3.

I now take a piece of material Mb which has been scored as indicated by the line and cut to non-rectangular form with 45 and 135 corners, as shown, and remove some of the abrasive at one end with the apparatus shown in Figure 2. This comprises a flat surface 6| of a bench or table, which may be a portion of the bench ID if desired, and upon which is mounted a motor 62. The motor 62 is secured to a bracket 63 which has a clamp 64 to clamp it thereto. The bracket 63 has trunnions 65 trunnioning it to the table- 6|, the trunnions 65 fitting in journal brackets 66. I provide an elevating screw 61 with a hand wheel 68 which is in threaded engagement with the outer end of the bracket 63. I provide a hold down screw 69 which is in threaded engagement with the table BI and passes through the bracket 63. By this means the motor can be raised and lowered.

The motor armature shaft 10 has secured thereon agrinding wheel 1 I. This wheel is preferably of aluminum oxide bonded with ceramic bond and of hard grade hardness, but other types of grinding wheels may be used. I provide a straight edge M against which the end of the material Mb may rest.

The operator passes the scored material Mb under the grinding wheel, as shown in Figure 2, which rips off the abrasive material therefrom, together with most of the glue or other adhesive, leaving at that point just the backing. In order to remove as much and no more than desired, the wheel Il may be raised or lowered by the means for raising and lowering the motor 62 described.

The material Mb is now in the form shown in Figure 3 with a scored line 60 therein and a portion 15 from which the abrasive has been removed. The operator now with a brush places glue upon the portion 15, then bends the material Mb into the form of a belt with abrasive on the outside. After the end of the belt is glued, it is lapped to the other end and the'joint is pressed by a suitable clamp or pressure device. The material is now in the form shown in Figure 4, in which a pair of belts Mo and Md are held together at the scoring line 60. These belts may be readily broken apart into two separate belts Mo and Md, as shown in Figure 5. The advantage of the method of procedure is that for a single abrasive removing operation and a single gluing operation, two, three or four belts may be made where one belt was made before. For certain long belts, I prefer an angle of 45, as shown in Figure 3. For belts which are relatively short in length as compared with their width, a wider angle is preferably used, such as for example an inside angle of 70 at the acute corners.

It will thus be seen that there has been provided by this invention a method and an article in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As various possible embodiments might be made of the mechanical features of the above. invention and as the art herein described might be varied in various parts, all without departing from the scope of the invention, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense.

I claim:--

Method of making several abrasive belts at one time which comprises providing a roll of coated abrasive material, drawing the abrasive material under a scorer, cutting the abrasive material to the desired length, joining the two ends together, and separating the wide belt into multiple narrower belts by separating along the scored lines.

' JAMES HOWARD BAKER. 

